Abstract
Active power filters (APF) aim at solving the harmonic problem originated by the nonlinear load in power systems. However, the high dv/dt and di/dt outputs from power electronic devices in a voltage source converter on APF introduced unwanted conducted electromagnetic interference (EMI) when compensating for the low-frequency harmonic components. Hence, this paper develops a spectrum analysis approach to investigate and quantify the source differential-mode (DM) voltage of a single-phase shunt APF to suppress the DM EMI via periodic carrier frequency modulation (PCFM). In this scheme, the analytical expressions of source DM voltage in the APF using the PCFM scheme are obtained with a double Fourier series. In addition, the influence of PCFM parameters on the source DM voltage spectrum is predicted based on the analytical expression. As a result, the PCFM parameters, which have the best suppression effect on the DM EMI are obtained. The experiment results proved the validity of the sawtooth PCFM APF with the maximum frequency deviation equal to 800 Hz in alleviating the APF DM EMI.
Highlights
Due to the harmonic pollution and the power quality issues of the power system caused by nonlinear electrical equipment, passive filters (PF) [1] and active power filters (APF) [2] continue to attract substantial attention
Experimental results validating that periodic carrier frequency modulation (PCFM) APF can effectively reduce thelower peak amplitudes of vAPF
Experimental results validate that the PCFM APF can effectively reduce the conducted DM electromagnetic interference (EMI)
Summary
Due to the harmonic pollution and the power quality issues of the power system caused by nonlinear electrical equipment, passive filters (PF) [1] and active power filters (APF) [2] continue to attract substantial attention. Can achieve narrower modulation bandwidth under premise of ensuring modulation can a anarrower modulation bandwidth thethe premise ofidea ensuring the the suppression effect ofachieve the conducted This paperunder presents a reliable to apply the suppression effect of the conducted. This paper presents a reliable idea to apply the the PCFM technology to an APF, which can suppress the conducted DM EMI. This paper proposes a new spectrum calculation method of source voltage voltage in a APF to in a PCFM APF to suppress the conducted DM EMI produced by the switching operation. This in a PCFM to suppress theproduced conducted byvoltage the switching operation.
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